<!--
this file is part of refractiveindex.info database
refractiveindex.info database is in the public domain
copyright and related rights waived via CC0 1.0
-->

<h1>Iron sesquioxide, Fe<sub>2</sub>O<sub>3</sub></h1>

Iron sesquioxide (Fe<sub>2</sub>O<sub>3</sub>), also known as ferric oxide or hematite, is a reddish-brown compound with various applications across industries. In optics, Fe<sub>2</sub>O<sub>3</sub> is often used as a pigment in coatings and materials that require specific absorption or scattering properties. Its optically active properties have also made it a subject of study for photonic and plasmonic applications, particularly in the development of sensors and imaging technologies. Thin films of Fe<sub>2</sub>O<sub>3</sub> have been investigated for use in optoelectronic devices and waveguides. While not a traditional optical material, iron sesquioxide provides specific characteristics beneficial to specialized optical applications and research.

<h2>Other names</h2>
<ul>
<li>Iron(III) oxide</li>
<li>Diiron trioxide</li>
<li>Iron oxide</li>
<li>Ferric oxide</li>
<li>Ferric iron</li>
<li>Red iron oxide</li>
<li>Rouge</li>
<li>Colcothar</li>
<li>Rust</li>
<li>Ochre</li>
</ul>

<h2>Minerals</h2>
<ul>
<li>Hematite (haematite)</li>
<li>Maghemite</li>
</ul>

<h2>External links</h2>
<ul>
<li><a href="https://en.wikipedia.org/wiki/Iron(III)_oxide">Iron(III) oxide - Wikipedia</a></li>
<li><a href="https://www.webelements.com/compounds/iron/diiron_trioxide.html">Diiron trioxide - WebElements</a></li>
<li><a href="https://en.wikipedia.org/wiki/Hematite">Hematite - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Maghemite">Maghemite - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Rust">Rust - Wikipedia</a></li>
<li><a href="https://en.wikipedia.org/wiki/Ochre">Ochre - Wikipedia</a></li>
</ul>
